function user (qqNo_, qqMarek_) {
  this.qqNo = qqNo_
  this.qqMarek = qqMarek_
  return `${this.qqNo} ${this.qqMarek}`
}

let userZ = user('123', '张三')
let userl = user('456', '李四')
let userW = user('789', '王五')
console.log(userZ)